Add workflow to delete caches on closed PRs

- evict cache files that untouched during the job run
- remove 6.8 workflow (6.9 should be sufficient)
- see #301

Author: mrbean-bremen

.github/workflows/build.yml

@@ -55,6 +55,7 @@ jobs:
       uses: hendrikmuhs/[email protected]
       with:
          key: ${{ runner.os }}-ubuntu-${{ matrix.container_version }} 
+         evict-old-files: 'job'
 
     - name: Build PythonQt
       run: |
@@ -214,6 +215,7 @@ jobs:
       uses: hendrikmuhs/[email protected]
       with:
          key: ${{ runner.os }}-${{ matrix.qt-version }} 
+         evict-old-files: 'job'
 
     - name: Detect exact versions
       id : versions

.github/workflows/build_latest.yml

@@ -20,7 +20,7 @@ jobs:
       fail-fast: false
       matrix:
         os: ['ubuntu', 'windows']
-        qt-version: [ '5.12.*', '5.15.*', '6.8.*', '6.9.*' ]
+        qt-version: [ '5.12.*', '5.15.*', '6.9.*' ]
         python-version: [ '3.12' ]
     runs-on: ${{ matrix.os }}-latest
     steps:
@@ -50,6 +50,7 @@ jobs:
       uses: hendrikmuhs/[email protected]
       with:
          key: ${{ runner.os }}-${{ matrix.qt-version }}
+         evict-old-files: 'job'
       if: ${{ matrix.os == 'ubuntu' }}
 
     - name: Set environment

.github/workflows/clean_caches.yml

@@ -0,0 +1,30 @@
+name: Cleanup caches on closed pull requests
+on:
+  pull_request:
+    types:
+      - closed
+
+jobs:
+  cleanup:
+    runs-on: ubuntu-latest
+    permissions:
+      actions: write
+      contens: read
+    steps:
+      - name: Cleanup caches
+        run: |
+          echo "Fetching list of cache keys"
+          cacheKeysForPR=$(gh cache list --ref $BRANCH --limit 100 --json id --jq '.[].id')
+
+          ## Setting this to not fail the workflow while deleting cache keys.
+          set +e
+          echo "Deleting caches..."
+          for cacheKey in $cacheKeysForPR
+          do
+              gh cache delete $cacheKey
+          done
+          echo "Done"
+        env:
+          GH_TOKEN: ${{ github.token }}
+          GH_REPO: ${{ github.repository }}
+          BRANCH: refs/pull/${{ github.event.pull_request.number }}/merge